It is pretty straightforward to take apart except for one important step. When you remove the rear sight to unscrew the cylinder end-cap there is a small pin which is there to prevent the cap being screwed in too far. This has to be removed before the cap can be unscrewed, and this can be tricky (impossible?) if it is rusted in or excessively tight. If the unwary does not know it is there and uses force to unscrew the cap then damage can result (shades of the Webley "Do not remove" end plug!) Usually the pin can be removed by unscrewing the end cap a tiny amount and tapping the cylinder until the pin drops out. If it is firmly stuck then I guess the only option would be to drill it out. Not a good design feature![]()